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* The Apache Software License, Version 1.1
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* Copyright (c) 2000-2002 The Apache Software Foundation. All rights
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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* 4. The names "Xerces" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* ====================================================================
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation and was
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* originally based on software copyright (c) 1999, International
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* Business Machines, Inc., http://www.apache.org. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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package org.apache.xml.serialize;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.UnsupportedEncodingException;
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import java.io.Writer;
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import org.apache.xerces.util.EncodingMap;
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* This class represents an encoding.
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* @version $Id: EncodingInfo.java,v 1.5 2003/11/04 19:24:54 mrglavas Exp $
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public class EncodingInfo {
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// Method: sun.io.CharToByteConverter.getConverter(java.lang.String)
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private static java.lang.reflect.Method fgGetConverterMethod = null;
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// Method: sun.io.CharToByteConverter.canConvert(char)
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private static java.lang.reflect.Method fgCanConvertMethod = null;
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// Flag indicating whether or not sun.io.CharToByteConverter is available.
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private static boolean fgConvertersAvailable = false;
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// An array to hold the argument for a method of CharToByteConverter.
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private Object [] fArgsForMethod = null;
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// name of encoding as registered with IANA;
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// preferably a MIME name, but aliases are fine too.
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// The charToByteConverter with which we test unusual characters.
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Object fCharToByteConverter = null;
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// Is the converter null because it can't be instantiated
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// for some reason (perhaps we're running with insufficient authority as
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boolean fHaveTriedCToB = false;
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* Creates new <code>EncodingInfo</code> instance.
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public EncodingInfo(String ianaName, String javaName, int lastPrintable) {
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this.ianaName = ianaName;
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this.javaName = EncodingMap.getIANA2JavaMapping(ianaName);
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this.lastPrintable = lastPrintable;
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* Returns a MIME charset name of this encoding.
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public String getIANAName() {
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return this.ianaName;
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* Returns a writer for this encoding based on
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* @return A suitable writer
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* @exception UnsupportedEncodingException There is no convertor
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* to support this encoding
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public Writer getWriter(OutputStream output)
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throws UnsupportedEncodingException {
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// this should always be true!
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if (javaName != null)
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return new OutputStreamWriter(output, javaName);
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javaName = EncodingMap.getIANA2JavaMapping(ianaName);
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// use UTF-8 as preferred encoding
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return new OutputStreamWriter(output, "UTF8");
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return new OutputStreamWriter(output, javaName);
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* Checks whether the specified character is printable or not
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* @param ch a code point (0-0x10ffff)
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public boolean isPrintable(char ch) {
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if(ch <= this.lastPrintable)
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if(fCharToByteConverter == null) {
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if(fHaveTriedCToB || !fgConvertersAvailable) {
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// forget it; nothing we can do...
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if (fArgsForMethod == null) {
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fArgsForMethod = new Object [1];
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// try and create it:
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fArgsForMethod[0] = javaName;
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fCharToByteConverter = fgGetConverterMethod.invoke(null, fArgsForMethod);
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} catch(Exception e) {
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// don't try it again...
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fHaveTriedCToB = true;
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fArgsForMethod[0] = new Character(ch);
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return ((Boolean) fgCanConvertMethod.invoke(fCharToByteConverter, fArgsForMethod)).booleanValue();
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} catch (Exception e) {
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// obviously can't use this converter; probably some kind of
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// security restriction
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fCharToByteConverter = null;
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fHaveTriedCToB = false;
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// is this an encoding name recognized by this JDK?
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// if not, will throw UnsupportedEncodingException
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public static void testJavaEncodingName(String name) throws UnsupportedEncodingException {
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final byte [] bTest = {(byte)'v', (byte)'a', (byte)'l', (byte)'i', (byte)'d'};
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String s = new String(bTest, name);
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// Attempt to get methods for char to byte
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// converter on class initialization.
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Class clazz = Class.forName("sun.io.CharToByteConverter");
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fgGetConverterMethod = clazz.getMethod("getConverter", new Class [] {String.class});
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fgCanConvertMethod = clazz.getMethod("canConvert", new Class [] {Character.TYPE});
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fgConvertersAvailable = true;
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// ClassNotFoundException, NoSuchMethodException or SecurityException
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// Whatever the case, we cannot use sun.io.CharToByteConverter.
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catch (Exception exc) {
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fgGetConverterMethod = null;
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fgCanConvertMethod = null;
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fgConvertersAvailable = false;
added
removed
src/org/apache/xml/serialize/EncodingInfo.java
